Greenheck TSU Base Unit Manual (464441) - Manual (Page 32)

Make-Up Air Unit 32
®
Evaporative Coolers
The media should be periodically brushed lightly with
a soft bristle brush in an up and down motion while
flushing with water. This aids in reducing the amount of
mineral build-up.
For large amounts of mineral build-up, clean or replace
the media and increase the water bleed-off or flush rate.
The cooling media has a useful life of 3 to 5 years
depending on the water quality and the bleed-off or
flush rate.
Leaving Air Entering Air
45º
15º
Media Orientation
IMPORTANT
When reinstalling the evaporative media, make sure
that it is installed correctly. Reference the drawing
shown below.
IMPORTANT
Replacement media should be from the same
manufacturer and be the same size as the original
media provided with the unit.
Maintenance - Fall
Start-Up
Repeat the Blower Start-Up Step 5 and Direct Gas
Start-Up Steps 1, 2 and 3. This will ensure that the
gas and air are set properly before the heating season
begins and should lead to trouble free operation all
winter.
High Limit
The high limit switch may have tripped over the
summer; it should be checked and reset if necessary.
Burner
Inspect the burner for accumulation of scales on both
the upstream and downstream sides of the mixing
plates. Any scaling or foreign material should be
removed with a wire brush.
Visually check that all holes in the mixing plates are
clear. If any burner ports are plugged (even partially),
clear them with a piece of wire or another appropriate
tool.
Replace or tighten any loose or missing fasteners on the
mixing plates. Always use zinc plated or stainless steel
fasteners.
Inspect and clean the flame and spark rod. Occasional
replacement of the flame rod and spark rod may be
necessary to ensure optimum unit performance.
Gas Train
The gas connections, joints and valves should be
checked annually for tightness. Apply a soap and water
solution or other approved leak test solution to all
piping; watch for bubbling which indicates a leak. Other
leak testing methods can be used.
Evaporative Coolers
The water should be shut off and all the lines drained
when the outside temperature drops below 45ºF.
Remove drain plugs for the winter.
Clean all interior parts of any mineral deposits or foreign
materials that may have built-up during the cooling
season.
Replace any worn or non-functioning parts.
WARNING
Do not enlarge burner ports when clearing a blockage,
performance could be affected.
NOTE
Flame rods can last many years, but because of
thermal expansion of the porcelain, flame rods can fail
over time.